Hydroacoustic sonar equipment
First Claim
1. In a hydroacoustic sonar system comprising transmitter-receiver means for beaming a pulse modulated radio frequency acoustic signal towards a target and receiving an echo signal reflected from the target, and means for deriving from the received echo signal a time varied gain corrected electrical signal to be demodulated and recorded, an improved means for demodulating said electrical signal comprising an input amplifier having a bandwidth of at least 500 kHz, a full wave detector means having a bandwidth of at least 500 kHz, the detector being coupled to the output of the amplifier, and an active low pass filter coupled to the output of the detector, the low pass filer having a cut off frequency of at least 50 kHz.
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Accused Products
Abstract
The invention relates to a hydroacoustic sonar system in which received signals are processed without extensive filtering thereby to conserve higher fourier components of the received signals and so conserve useful information of targets. This is achieved by using a wideband detector module to effect demodulation of the received signals, and so eliminating the usual intermediate frequency stage. The module comprises a wideband input amplifier, a wideband full wave detector and an active low pass filter having a cut off frequency of at least 50 kHz.
12 Citations
2 Claims
- 1. In a hydroacoustic sonar system comprising transmitter-receiver means for beaming a pulse modulated radio frequency acoustic signal towards a target and receiving an echo signal reflected from the target, and means for deriving from the received echo signal a time varied gain corrected electrical signal to be demodulated and recorded, an improved means for demodulating said electrical signal comprising an input amplifier having a bandwidth of at least 500 kHz, a full wave detector means having a bandwidth of at least 500 kHz, the detector being coupled to the output of the amplifier, and an active low pass filter coupled to the output of the detector, the low pass filer having a cut off frequency of at least 50 kHz.
Specification
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- Resources
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Current AssigneeKinectrics Incorporated
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Original AssigneeBlair E. Sim, Gerald A. Hunt, Paul H. Patrick
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InventorsPatrick, Paul H., Sim, Blair E., Hunt, Gerald A.
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Primary Examiner(s)Tarcza, Thomas H.
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Assistant Examiner(s)Pihulic, Daniel T.
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Application NumberUS07/360,200Time in Patent Office439 DaysField of Search367/87, 367/99, 367/100, 367/135, 73/620, 73/629US Class Current367/135CPC Class CodesG01S 7/526 ReceiversG01S 7/529 Gain of receiver varied aut...
